Include cerrno (gcc-3.4 fix)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13091 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-nm/llvm-nm.cpp b/tools/llvm-nm/llvm-nm.cpp
index c5930e9..6aaf7d2 100644
--- a/tools/llvm-nm/llvm-nm.cpp
+++ b/tools/llvm-nm/llvm-nm.cpp
@@ -22,6 +22,7 @@
 #include "Support/FileUtilities.h"
 #include "Support/Signals.h"
 #include <cctype>
+#include <cerrno>
 #include <cstring>
 
 using namespace llvm;